Adjustable strap-support.



A. T. KEITH.

ADJUSTABLE STRAP SUPPORT.

APPLICATION man OCT- 10. ms.

Patented Apr. 27, 1915.

ALFRED T. 1m TH 4% Q A TTORA/E IHE NORR' HLTERS C0,, PHOTILLITHOH WASHINGTON. D. C.

rip,

' ALFRED 'I. KEITH, OF BR-IDGEWATER, BIASSACHUSETTS.

ADJUSTABLE STRAP-SUPPORT.

masses.

Specification of Letters Patent. Patentedidrprr z, 11915.;

Application filed October 10, 1913. Serial No. 794,464.

i which the following is a specification.

My invention relates to means for clamping an object on to the work-bed of a machine-tool, and is designed to be used in C011",-

nection with a strap hearing at one end upon the support, and at the other end upon said object, the. strapbeing clamped to the workbed of the machine-tool bymeans of a bolt engaging said strap and work-bed.

The invention has for its object to provide a strap support adapted to be used within a wide range of elevation from the surface'of the work-bed of a machine-tool, and one that may be readily and quickly adjusted to the level of the top of the work onthe workbed with the greatest exactness within "the limits of the device and held securely in such adjusted position. I

Those objectsI attain by the'mechanismj illustrated in the accompanying drawings, 1nwhich similar characters of reference indicate corresponding parts throughout the.

drawings, and in which- Figure 1 is a sideelevation of an adjustable strap support embodying my invention, applied to the Work-bed oft-a machine-tool, together with a clamping strap secured by a bolt to the work-bed of the machine-tool, and bearing at one end upon the upper-surface of the adjustable support, and atthe other end upon a piece of work clamped to the work-bed of the machine-tool. Fig. 2 is a horizontal transverse section taken on the line 22 of Fig. 1. 7

As illustrated in the drawings, 1 represents a base section having a smooth or unserrated inclined recessed face 2, and oppositely disposed inclined outer ribs 3. The base section 1 is also provided with a longitudinal slot 4; extending transversely from the inclined recessed face 2 of the base section, through the body and opposite wall of said section; and in length from the dotted line 5 to the dotted line 6 of Fig. 1. An adjustable section 7 is mounted upon the base section 1 and is also provided with an insaid face 8 bearing against the inner side walls of the r1bs8 of the base section 1. The

adjustable section 7 is provided with a clamping device, preferably a bolt 9, having an angular shoulder 10v engaging a corresponding opening in the lower portion of the adjustable section, and a bolt head 11, the opposite end of said bolt being threaded to engage a thumb nut 12 .which bears against the vertical back of the'base section.

The adjustable section 7 is also'provided with an offset shoulder 13 forming a step;

in position one end of a strap 15. The opposite end of said strap is designed to bear on an object 16 supported upon the workbed 17 of a machine-tool. .A slot or recess 18 may be formed in the work-bed of the c v machine-tool to engage the head 19 of a bolt 20, while the upper threaded end of thebolt extends through an opening formed in the strap 15 and engages a nut 21, by means of which;the strap may be clamped tightly on as much as possible, without taking away from its'eiiioiency, at thesame time providing a handle or gripping surface 23 by means of which the support may be conveniently carried. I i

' It is important that a strap employed for clamping a piece of work to the work-bed of a machine-tool shall bear evenly on the sible; and to that end it is important that the means designed to support the opposite end of the strap be adjusted at exactly the level or height of the work to be clamped to the work-bed. If the adjustment of the strap support be determined by or dependent upon teeth or serrations, an exact, even adjustment of the level of the bearing surface of the strap support and the upper surface of the work cannot be readily obtained, and therefore the respective ends of the strap do not bear evenly on the work and the support, andthe work is not clamped as firmly and securely to the work-bed as it should be. 7

In the device herein shown and described,

the adjustable section has sliding engagement with thebase section, and it consequently can be adjusted at any desired point relatively to thebase section, no matter how fine an adjustment'maybe desired in order to bring the upper or supporting surface 14 of the adjustablesection on 'a'level with the f upper surface of the work 16. The special means herein provided for clamping the adjustable section to the base section enable the upper bearing surface of the adjustable sejCti nto'bej quickly, as Well as accurately,

-"adjus'tedt'o the level of the work to be clamped onjthe work-bed, for the reason 1 5Kthat the bolt when inuse has a variable effective or working length dependingon the position oftheadjustable member on its base, and When the thumb Vnut'12 on the'bolt 9 is screwed up against the vertical back of the basese'ctiomthe upper or adjustable section 7 is locked against any downward movement 7 o of the adjustable section. In applying the V strap support in actual use, the surface 14: of

the adjustable section may be placed slightly "above the level of the upper surface of the work 16 and the strap placed on the work and I they support By gradually retracting I i the thumb nutl2on the bolt 9, the adjusttheupper surface of the work 16. The nut 21 on the bolt is then brought down tight onthe strap 15 and the ends of the strap 15 bear 'firm and true on the support and'the work, thereby firmly clamping the work to the work-be There, are occasions at times for clamping j 0 to the work-bedof a" machine-tool an object,

@the height of which is below that of-the strap support. In such cases the offset step or shoulder 13 is used to support one end of O'opies of this patent may be obtained for the strap, instead of using the upper end or auxiliary surface 14 of the support.

What I claim as new and desire to secure by Letters Patent is 1. A strap support comprising, a base having a verticalback a smooth vertically inclined face and a slot extending through said base, an adjustable section provided 7 with a smooth vertically inclined face having a sliding engagement with that of the base, a bolt secured to the adjustable section and extending through said slot, and a nut engaging the end of the bolt and the vertical back of the base.

2. Astrap supportcomprising, a base having a vertical back a smooth vertically inclined face and a slot extending through said base, an adjustable section provided with a smooth vertically inclined face having a sliding engagement with that of the base and with an olfset shoulder forming a bearingsurface intermediate the ends of said adjustable section, a bolt secured to the adjustable section and extending through said slot, and a nut engaging the end of the bolt andth'evertical back of the base.

3.A strap support comprising, a base having a vertical back a smooth vertically inclined face and a slot extending through saidgbase, an adjustable section provided with a smooth vertically inclined face having a sliding engagement with that of the base, said section being cut away centrally to form a combined handle and brace, a bolt secured to the adjustable section and extending through said slot, and a nut engagingthe end of the bolt and the vertical back ofthe-base.

ALFRED T. KEITH.

Witnes'sesz' CHARLES PERKINS, H RY K. PERKINS.

five cents each'yby addressing the Commissioner of Patents,

Washington, I). 0. 

